<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="shortcut icon" href="./favicon.ico" type="image/x-icon"/>

    <title>基于LBSN的POI数据挖掘</title>
    <style type="text/css">
       #networklabel{
           height: 380px;
           text-align: center;
       }
       #networklabel p{
           color: #3476b1;
       }

    </style>

</head>
<body>
<div id="networklabel">
    <img src="server-error-500.png" alt="6">
    <p>网络连接出错，请检查后重试</p>
    <a href="./">主页</a>
</div>
<script type="text/javascript">
    window.onload=function(){
        var height=document.documentElement.clientHeight
        var networklabel=document.getElementById("networklabel");
        var margin_top=(height-networklabel.offsetHeight)/2;       //因为此div在页面中只用了一次且以后不会改变，所以写了数值，如果是不确定的，获取到高度放着这里就可以
        networklabel.style.marginTop=margin_top+"px";
    };
</script>
</body>
</html>
